南水北调中线工程源头生态环境时空变化RSEI评价 *

本文以南水北调(中线)水源地淅川县为研究对象,利用2007、2013、2019年水源地淅川县的landsatTM/OLI遥感影像数据结合ENVI平台对南水北调(中线)水源地近年生态环境变化作出评价。通过主成分分析法将绿度(NDVI)、湿度(WET)、干度(NDBSI)、热度(LST)四个指标集成为水源地生态遥感指数(RSEI),对研究区2007-2019年的生态环境质量进行评估。2007-2019年研究区的总体生态质量以一般和良好为主,两者所占面积比例均超过75%;3个时期的RSEI均值分别为0.7565、0.6989、0.709。南水北调(中线)水源地生态环境质量2007-2019年间其整体呈现先下降后上升的趋势,生态良好区域面积有所增加。

Spatial-temporal change assessment of the ecological environment at the source of the South-to-North Water Transfer Middle Route Project based on the RSEI index

This paper takes Xichuan County, the water source of the South-to-North Water Transfer (Middle Route), as the research object, and uses the landsat TM/OLI remote sensing image data of Xichuan County, the water source in 2007, 2013 and 2019, combined with the ENVI platform to evaluate the ecological environment changes of the water source of the South-to-North Water Transfer (Middle Route) in recent years. The four indicators of greenness (NDVI), humidity (WET), dryness (NDBSI) and heat (LST) were integrated into the ecological remote sensing index (RSEI) of the water source by principal component analysis to evaluate the ecological environment quality of the study area from 2007 to 2019. From 2007 to 2019, the overall ecological quality of the study area was mainly general and good, accounting for more than 75% of the area; The average RSEI of the three periods was 0.7565, 0.6989 and 0.709 respectively. The ecological environment quality of the water source area of the South-to-North Water Transfer (Middle Route) showed a trend of decline first and then rise during 2007-2019, and the area of ecologically sound areas increased.